The ammonoids from the Late Permian <i>Paratirolites</i> Limestone of Julfa (East Azerbaijan, Iran)

<p>The Changhsingian (Late Permian), 4 to 5 m thick <i>Paratirolites</i> Limestone has yielded diverse ammonoid assemblages composed of the genera <i>Neoaganides</i>, <i>Pseudogastrioceras</i>, <i>Dzhulfites</i>, <i>Paratirolites</i>, <i>Julfotirolites</i>, <i>Alibashites</i>, <i>Abichites</i>, <i>Stoyanowites</i> and <i>Arasella</i>. The succession of ammonoid species allows for a subdivision of the rock unit into eight biozones, in ascending order: <i>Dzhulfites zalensis</i> Zone, <i>Paratirolites trapezoidalis</i> Zone, <i>Paratirolites kittli</i> Zone, <i>Stoyanowites dieneri</i> Zone, <i>Alibashites mojsisovicsi</i> Zone, <i>Abichites abichi</i> Zone, <i>Abichites stoyanowi</i> Zone and <i>Arasella minuta</i> Zone. The following 20 new species are described by two of us (DK and AG): <i>Neoaganides ultimus</i> sp. nov., <i>Pseudogastrioceras relicuum</i> sp. nov., <i>Dzhulfites zalensis</i> sp. nov., <i>Dzhulfites hebes</i> sp. nov., <i>Paratirolites coronatus</i> sp. nov., <i>Paratirolites birunii</i> sp. nov., <i>Paratirolites quadratus</i> sp. nov., <i>Paratirolites multiconus</i> sp. nov., <i>Paratirolites serus</i> sp. nov., <i>Julfotirolites kozuri</i> sp. nov., <i>Alibashites ferdowsii</i> sp. nov., <i>Alibashites uncinatus</i> sp. nov., <i>Alibashites stepanovi</i> sp. nov., <i>Abichites subtrapezoidalis</i> sp. nov., <i>Abichites alibashiensis</i> sp. nov., <i>Abichites ariaeii</i> sp. nov., <i>Abichites paucinodus</i> sp. nov., <i>Abichites shahriari</i> sp. nov., <i>Abichites terminalis</i> sp. nov. and <i>Stoyanowites aspinosus</i> sp. nov. After the time-equivalent Chinese occurrences, the material described here is the most diverse assemblage known from the critical interval before the end-Permian mass extinction.</p> <p><a href="http://zoobank.org/urn:lsid:zoobank.org:pub:75D71EE8-27A2-48B1-805B-52E98578A7B8" target="_blank">http://zoobank.org/urn:lsid:zoobank.org:pub:75D71EE8-27A2-48B1-805B-52E98578A7B8</a></p>